121521200 has 30 divisors (see below), whose sum is σ = 291955644. Its totient is φ = 48608320.

The previous prime is 121521199. The next prime is 121521203. The reversal of 121521200 is 2125121.

It is not an unprimeable number, because it can be changed into a prime (121521203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 151502 + ... + 152301.

Almost surely, 2^121521200 is an apocalyptic number.

121521200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121521200 is an abundant number, since it is smaller than the sum of its proper divisors (170434444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121521200 is a wasteful number, since it uses less digits than its factorization.

121521200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303821 (or 303810 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 121521200 is about 11023.6654521080. The cubic root of 121521200 is about 495.3178925962.

Adding to 121521200 its reverse (2125121), we get a palindrome (123646321).

The spelling of 121521200 in words is "one hundred twenty-one million, five hundred twenty-one thousand, two hundred".